If they both came from a B230ET and neither was a modification, i would use the bright shiny, best condition one with the least play in the bearings. I would also dribble some clean engine oil into the oil feed to the bearings and turn the shaft by hand to circulate it so the bearing can have a "pre-soak" in oil before first use on the car.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
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